99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/*
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* Copyright 2019 Google LLC.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPathBuilder.h"
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/**
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* Repro case for https://bugs.chromium.org/p/chromium/issues/detail?id=913223
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*
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* The original bug was filed against square caps, but here we also draw the labyrinth using round
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* and butt caps.
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*
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* Square and round caps expose over-coverage on overlaps when using coverage counting.
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*
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* Butt caps expose under-coverage on abutted strokes when using a 'max()' coverage function.
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*/
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static void draw_labyrinth(SkCanvas* canvas, SkPaint::Cap cap) {
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constexpr static bool kRows[11][12] = {
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{1,1,1,1,1,1,1,1,1,1,1,1},
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{0,1,0,1,0,1,0,0,0,0,1,1},
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{0,0,0,0,1,0,0,0,0,1,1,1},
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{1,0,1,0,0,0,0,1,0,0,0,0},
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{0,1,1,0,0,0,0,0,0,1,1,1},
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{1,0,0,1,0,0,0,0,1,1,1,0},
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{0,1,0,1,1,1,0,0,1,1,1,0},
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{1,0,1,0,1,1,1,1,0,1,1,1},
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{0,0,1,0,0,1,0,0,0,0,0,1},
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{0,1,1,1,0,0,1,1,1,1,0,0},
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{1,1,1,1,1,1,1,1,1,1,1,1},
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};
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constexpr static bool kCols[13][10] = {
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{1,1,1,1,0,1,1,1,1,1},
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{0,0,1,0,0,0,1,1,1,0},
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{0,1,1,0,1,1,1,0,0,1},
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{1,1,0,0,0,0,1,0,1,0},
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{0,0,1,0,1,0,0,0,0,1},
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{0,0,1,1,1,0,0,0,1,0},
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{0,1,0,1,1,1,0,0,0,0},
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{1,1,1,0,1,1,1,0,1,0},
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{1,1,0,1,1,0,0,0,1,0},
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{0,0,1,0,0,0,0,0,0,1},
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{0,0,1,1,0,0,0,0,1,0},
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{0,0,0,0,0,0,1,0,0,1},
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{1,1,1,1,1,1,0,1,1,1},
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};
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SkPathBuilder maze;
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for (size_t y = 0; y < SK_ARRAY_COUNT(kRows); ++y) {
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for (size_t x = 0; x < SK_ARRAY_COUNT(kRows[0]); ++x) {
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if (kRows[y][x]) {
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maze.moveTo(x, y);
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maze.lineTo(x+1, y);
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}
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}
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}
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for (size_t x = 0; x < SK_ARRAY_COUNT(kCols); ++x) {
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for (size_t y = 0; y < SK_ARRAY_COUNT(kCols[0]); ++y) {
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if (kCols[x][y]) {
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maze.moveTo(x, y);
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maze.lineTo(x, y+1);
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}
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}
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}
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(.1f);
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paint.setColor(0xff406060);
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paint.setAntiAlias(true);
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paint.setStrokeCap(cap);
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canvas->translate(10.5, 10.5);
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canvas->scale(40, 40);
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canvas->drawPath(maze.detach(), paint);
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}
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constexpr static int kWidth = 500;
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constexpr static int kHeight = 420;
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DEF_SIMPLE_GM(labyrinth_square, canvas, kWidth, kHeight) {
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draw_labyrinth(canvas, SkPaint::kSquare_Cap);
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}
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DEF_SIMPLE_GM(labyrinth_round, canvas, kWidth, kHeight) {
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draw_labyrinth(canvas, SkPaint::kRound_Cap);
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}
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DEF_SIMPLE_GM(labyrinth_butt, canvas, kWidth, kHeight) {
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draw_labyrinth(canvas, SkPaint::kButt_Cap);
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}
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